[gtkemp]

Hello and thanks in advance for any help.

I am new to CNC turning. I have been getting use to the control on the Haas TL-2 in particular the IPS quick programing layer.

I have been able to setup the tools and the offsets and use the canned operations. I have one problem that is driving me nuts.

When I setup an OD turning cycle (G71), the machine cuts air for several passes , for example:

start diameter: 2.000
Final diameter: 1.75
Depth of cut: .010
Feed: .005

The cut always starts about .050 larger than the start diameter. So in the example above the canned cycle would start and progress like this:

X= 2.050
X= 2.040
X= 2.030
X= 2.020
X= 2.010
X= 2.000
X= 1.990 (finally removing stock)

The final diameter turns out fine.

I cannot figure out where the "boy now that was stupid" ah ah answer is. Does it have to do with the retraction clearance maybe?

Please Help

[dcoupar]

Why not post the program so we can help. A few blocks before the G71 and a few blocks after the end of the shape definition.